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avcodec/jpeg2000dec: Use 32x32->64bit for 5/3 dequantization

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This fixes overflows, using fewer bits would impact high bit depth quality

Fixes Ticket4654

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-24 17:00:58 +02:00
parent 5a1f785249
commit 8ff09e9098
1 changed files with 1 additions and 1 deletions
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libavcodec/jpeg2000dec.c
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@ -1437,7 +1437,7 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x];
int *src = t1->data[j];
for (i = 0; i < w; ++i)
datap[i] = (src[i] * band->i_stepsize) / 32768;
datap[i] = (src[i] * (int64_t)band->i_stepsize) / 32768;
}
}